问题
解答题
(1)1
(2)[11.9-3.4×(10.802-9.802)]÷85% (3)10÷25+2
(4)(8
|
答案
(1)1
×[(7 9
+0.25)÷(3 8
-5 6
)],5 9
=1
×[(7 9
+3 8
)÷(1 4
-15 18
)],10 18
=1
×[7 9
÷5 8
],5 18
=1
×7 9
,9 4
=4;
(2)[11.9-3.4×(10.802-9.802)]÷85%,
=[11.9-3.4×1]÷0.85,
=[11.9-3.4]÷0.85,
=8.5÷0.85,
=10;
(3)10÷25+2
×0.4-11 2 2 5
=0.4+2.5×0.4-1.4,
=0.4+1-1.4,
=1.4-1.4,
=0;
(4)(8
-10.5×2 5
)×(34 5
+7.5)1 6
=(8
-8.4)×(32 5
+71 6
),1 2
=0×10
,2 3
=0.